Which import a should avoid for validate

Question about the task

Under discussion

The output its correct, i think the problem is the requirement: Only use classes and methods from the java.nio package. But i dont know how to do thi task in a different way Or maybe its because im using recursion?

Write a program that will read detailed information about a folder and display it on the console.

First of all, read the folder path from the console.
If the entered path is not a directory, display "[full path] is not a folder" and exit the program.
Then calculate and display the following information:

Total folders: [the number of folders in the directory and subdirectories]
Total files: [the number of files in the directory and subdirectories]
Total size: [the total number of bytes stored in the directory]

Only use classes and methods from the java.nio package.

Don't display the square brackets ("[]").

Requirements:

The main method must read the folder path from the console.
If the entered path isn't a directory, you need to display "[full path] is not a folder" and exit the program.
Only use classes and methods from the java.nio package.
The following information must be displayed on the console: "Total folders: [the number of folders in the directory and subdirectories]".
The following information must be displayed on the console: "Total files: [the number of files in the directory and subdirectories]".
The following information must be displayed on the console: "Total size: [the total number of bytes stored in the directory]".

package com.codegym.task.task31.task3113; import java.io.BufferedReader; import java.io.File; import java.io.IOException; import java.io.InputStreamReader; import java.nio.file.*; import java.nio.file.attribute.BasicFileAttributes; import java.util.concurrent.atomic.AtomicInteger; import java.util.concurrent.atomic.AtomicLong; /* What's in the folder? */ public class Solution { public static Path cartella; public static int foldersCount = 0; public static int filesCount = 0; public static long totalBytesCount = 0; public static void main(String[] args) throws IOException { BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); cartella = Paths.get(reader.readLine()); if(!Files.isDirectory(cartella)) System.out.println(cartella + " is not a folder"); else { //foldersCount++; - When counting the number of folders, don't count the original directory. iteratorMethod(cartella.toFile().listFiles()); System.out.println("Total folders: " + foldersCount); System.out.println("Total files: " + filesCount); System.out.println("Total size: " + totalBytesCount); } } public static void iteratorMethod (File[] filesList){ for(File file : filesList ){ if(file.isDirectory()){ iteratorMethod(file.listFiles()); foldersCount++; }else { filesCount++; long size = file.length(); totalBytesCount += size; } } } } //C:\Users\39348\OneDrive\Desktop\Directory

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Guadalupe Gagnon

Level 37 , Tampa, United States

13 January 2021, 14:55

I solved this using:

Files.walkFileTree(path, new FileVisitor<Path>{
   // overridden methods
});

Figure out how to implement the anonymous class in that snippet (the FileVisitor), with a little trial and error, and you should be able to figure out how to arrive at the correct solution. I did so by adding System.out.println() methods inside each of the over ridden methods until I started to understand how that worked. It may seem complicated and daunting at first, but once you start seeing the results it isn't too hard to use them to get the information you need for this task.

LennyMan

Level 25 , Lucca, Italy

14 January 2021, 14:34

Thank you for your reply, basically i should use the walkFileTree method insted of recursion

Guadalupe Gagnon

Level 37 , Tampa, United States

14 January 2021, 14:48

Now, I am sure there are other ways that this can be solved, but the walkFileTree() method is made specifically for instances like this. I'll give you a little more of a hint: I used counters that were local to the code outside the method and could be accessed directly from the FileVisitor() class. So, it looked similar to this outline:

counter1
counter2
counter3
Files.walkFileTree(directory, new FileVisitor<Path>() {
   method1{
      increase counter1
   }

   method2{
      increase counter2
      increase coutner3
   }

   //other methods
}

// output results

Nouser

Level 36 , Germany

14 January 2021, 15:00

I've solved that with walkFileTree and the other solution with walk. The latter however is nice just for couning dirs and files. For the size it needed exception handling inside the stream.

Nouser

Level 36 , Germany

13 January 2021, 13:00

you're using the File class <---> Only use classes and methods from the java.nio package. I had another task with the same requirement that drove me crazy.